babel-preset-stage-3 is a Babel preset that enables experimental JavaScript features currently in Stage 3 of the TC39 standardization process. Stage 3 signifies that a feature is a candidate for inclusion in a future ECMAScript standard. Using this preset allows developers to leverage these features, such as class properties and optional chaining, before they are officially standardized, providing an opportunity to experiment and offer feedback. However, be mindful of potential breaking changes before final standardization.